脉经曰∶妇人怀躯七月，而不可知，时时衄血而转筋者，此为躯也，衄时嚏而动者，非
躯也。《素问》曰∶妇人足少阴脉动甚者，妊子也。阴搏阳别，谓之有子。（王注云∶阴，谓尺中
也，搏，谓搏触于手也，此脉搏击，与寸脉殊别，则谓有孕之兆。）（《素问》以足少阴脉动甚
为有妊，《脉经》以手少阴脉动甚为有妊，岂心肾同一诊耶？此只言《素问》，盖亦有见）
脉经曰∶妊脉初时，寸微小，呼吸五至，三月而尺数也，脉滑疾重，以手按之散者，胎已
三月也，脉重手按之，不散但疾不滑者，五月也。尺脉左偏大为男，右偏大为女，左右俱
大，产二子，大者如实状。（实字妙）妇人妊娠四月，欲知男女法，左疾为男，右疾为女，俱疾
为二子（王子亨云，妊娠三部俱滑而疾；在左为男，在右为女）（诊在尺脉，的是至论。然于王
子亨云说，亦为禀浓者言）。遣妊娠人面南行，还复呼之，左回首者是男，右回首者是女。
看上圊时，夫从后急呼之，左回首者是男，右回首者是女也。
楼全善云∶按丹溪云，男受胎在左子宫，女受胎在右子宫，新言大契，是说也。盖男受
胎在左，则左重，故回首时，慎护重处而就左也；女胎在右则右重，故回首慎护重处而就右
也。推之于脉，其义亦然，胎在左则血气护胎而盛于左，故脉亦从之，而左疾为男，左大为
男也；胎在右则血气护胎而盛于右，故脉亦从之，而右疾为女，右大为女也。亦犹经云∶阴搏
阳别，谓之有子。言受胎处在脐腹之下，则血气护胎而盛于下，故阴之尺脉鼓搏有力，而与
阳之寸脉殊别也。又如痈节发上，则血气从上，而寸脉盛，发下则血气从下，而尺脉盛，发
左则血气从左。而左脉盛，发右则血气从右脉盛也，丹溪以左大顺男。右大顺女，为医人之
左右手，盖智者之一失也。（丹溪以此诊男女之病。原不诊产妇。须知之）
《脉经》说：妇女怀孕七个月，如果难以察觉，时常流鼻血并发生肌肉痉挛（转筋），这是怀孕的表现；如果在流鼻血时打喷嚏且身体随之震动，则不是怀孕。
《素问》说：妇女足少阴肾经脉动特别明显的，是怀孕了。（王冰注解说：阴，指的是尺部脉；搏，指脉搏跳动触及手指的感觉，这种脉搏的跳动与寸部脉不同，就称为有孕的征兆。）
（《素问》认为足少阴脉动甚是有孕，《脉经》认为手少阴心经脉动甚是有孕，难道心和肾的诊法是一样的吗？这里只引用《素问》，大概也是有其见地的。）
《脉经》说：妊娠初期的脉象，寸口脉微小，呼吸五次脉搏跳动一次（即脉率正常偏慢）；到了三个月，尺部脉变数（快）。脉象滑利而疾速，用手重按感觉散漫的，是怀孕三个月了；脉象重按不散，但脉疾而不滑的，是怀孕五个月了。尺脉左侧偏大为男孩，右侧偏大为女孩，左右都大，生双胞胎，脉大者如同充实有力的状态。（“实”字用得很妙。）
判断妇女怀孕四个月时胎儿性别的办法：左手脉疾快为男，右手脉疾快为女，双手脉都疾快为生双胞胎。（王子亨说，妊娠三部脉都滑利而疾快；在左侧为男，在右侧为女。）（诊断主要在尺脉，确实是精辟的理论。然而对于王子亨的说法，也是针对禀赋浓厚的人而言的。）
让孕妇面向南方行走，然后突然呼唤她，向左回头的是男孩，向右回头的是女孩。
看孕妇上厕所时，丈夫从后面急忙呼唤她，向左回头的是男孩，向右回头的是女孩。
楼全善说：按照丹溪先生的说法，男性胚胎着床在左子宫，女性胚胎着床在右子宫，新的言论非常契合，就是这个道理。因为男性胚胎在左边，所以左侧沉重，因此回头时会小心保护沉重的一侧而转向左边；女性胚胎在右边，所以右侧沉重，因此回头时会小心保护沉重的一侧而转向右边。推演到脉象上，道理也是一样的，胎在左边，则气血护佑胎元而在左侧旺盛，所以脉象也顺应它，左侧疾快为男，左侧脉大为男；胎在右边，则气血护佑胎元而在右侧旺盛，所以脉象也顺应它，右侧疾快为女，右侧脉大为女。这也正如经文所说：“阴搏阳别，谓之有子。”意思是受胎处在脐腹之下，则气血护佑胎元而在下部旺盛，所以阴部的尺脉鼓搏有力，而与阳部的寸脉不同。又比如痈疽发作在上部，则气血趋向于上，寸脉盛；发作在下部，则气血趋向于下，尺脉盛；发作在左侧，则气血趋向于左侧，左侧脉盛；发作在右侧，则气血趋向于右侧，右侧脉盛。丹溪先生以左手脉大为顺男，右手脉大为顺女，是指医生的左右手，这大概是智者的一个失误吧。（丹溪是用这个方法来诊断男女疾病的，原本不是用来诊断产妇的，需要知晓这一点。）
The *Mai Jing* (Pulse Classic) states: When a woman is seven months pregnant, it may be difficult to ascertain. If she frequently experiences epistaxis (nosebleed) accompanied by muscle spasms (twitching/cramping), this indicates pregnancy. However, if she sneezes and her body trembles during the nosebleed, it is not pregnancy.
The *Su Wen* (Basic Questions) states: When the pulse of the Foot Shaoyin (Kidney Meridian) in a woman beats strongly, she is pregnant. "Yin bo yang bie" (the Yin pulse beats distinctly different from the Yang pulse) is called having a child. (Wang Bing's commentary notes: "Yin" refers to the Chi (cun-kuan-chi) position at the wrist; "bo" refers to the palpable beating sensation under the fingers. This pulse beats differently from the Cun (inch) pulse, which is a sign of pregnancy.)
(The *Su Wen* considers strong pulsation of the Foot Shaoyin as a sign of pregnancy, while the *Mai Jing* considers strong pulsation of the Hand Shaoyin (Heart Meridian) as a sign. Are the diagnostic methods for the Heart and Kidney identical? Here only the *Su Wen* is cited, suggesting there may be some validity to this view.)
The *Mai Jing* states: In the early stages of pregnancy, the Cun (inch) pulse is small and fine, with five breaths per pulse beat. By three months, the Chi (cubit) pulse becomes rapid (shu). If the pulse is slippery (hua) and rapid, and feels dispersed when pressed heavily, the fetus is three months old. If the pulse remains undispersed when pressed heavily but is rapid without being slippery, the fetus is five months old. A Chi pulse that is larger on the left indicates a male fetus; larger on the right indicates a female fetus; large on both sides indicates twins. The larger pulse resembles a "solid" (shi) condition. (The character "shi" is apt.)
To determine the sex of the fetus at four months of pregnancy: A rapid pulse on the left hand indicates a male; on the right hand, a female; rapid on both hands indicates twins. (Wang Ziheng stated that if all three positions of the pregnancy pulse are slippery and rapid, left-side predominance indicates a male, and right-side predominance indicates a female.) (Diagnosing based on the Chi pulse is indeed a profound theory. However, Wang Ziheng's statement likely applies to individuals with robust constitution.)
Have the pregnant woman walk facing south, then suddenly call her name. If she turns her head to the left, it is a boy; if to the right, it is a girl.
When the pregnant woman is using the toilet, have her husband call out to her urgently from behind. If she turns her head to the left, it is a boy; if to the right, it is a girl.
Lou Quanshan stated: According to Danxi, the male embryo implants in the left uterus, and the female embryo in the right uterus. This new theory aligns well with the aforementioned observations. Since the male embryo is on the left, the left side feels heavier; thus, when turning her head, she instinctively protects the heavy side and turns left. Since the female embryo is on the right, the right side feels heavier; thus, she protects the heavy side and turns right. Extending this logic to pulse diagnosis: if the fetus is on the left, qi and blood protect the fetus and become abundant on the left, so the pulse reflects this, making left-side rapidness or largeness indicate a male. If the fetus is on the right, qi and blood become abundant on the right, so the pulse reflects this, making right-side rapidness or largeness indicate a female. This is also consistent with the classic saying: "Yin bo yang bie, wei zhi you zi" (The Yin pulse beats distinctly different from the Yang pulse, indicating pregnancy). It means that since conception occurs below the umbilicus, qi and blood gather below to protect the fetus, causing the Yin Chi pulse to beat powerfully, distinct from the Yang Cun pulse. Similarly, if an abscess erupts above, qi and blood rise, and the Cun pulse becomes strong; if below, they descend, and the Chi pulse becomes strong; if on the left, the left pulse becomes strong; if on the right, the right pulse becomes strong. Danxi’s assertion that a large left pulse favors a male and a large right pulse favors a female, referring to the physician's own left and right hands, was likely a mistake by a wise man. (Danxi used this method to diagnose diseases in men and women, not originally for diagnosing pregnant women. This must be noted.)